Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47521aa095c8390…

MALICIOUS

PDF

75.5 KB Created: 2021-10-06 21:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5159e74456b6adf2eae85a7393550beb SHA-1: 5c14ebad0b5b8c6e72660dbe26a47611d9bf480b SHA-256: d47521aa095c8390e202b5d3c4d30266adc2267cc949660425bffac3733e16af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/uplcv?utm_term=can+you+catch+herpes+from+sharing+a+drink PDF link annotation
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614c72c927f9c---83450500948.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/zibofuxiwesidexeruduguta.pdfIn PDF document text
    • http://kaies.cn/upfiles/210903131145392716ksrt7g.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/zomedikewafafipezufedaku.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16153a988c4059---kitekudezosawefuzaj.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/vijomavupamogel.pdfIn PDF document text
    • https://mauspro.net/upload/files/tekapifi.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/6239763906.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/30367014953.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/zisurofakosopesevuwafi.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/97218127346.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/94343579533.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/fijobusozarujorifefaluki.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/rukorokagabexepemuke.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/54395892781.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/90670612907.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/49618021549.pdfIn PDF document text
    • https://bor-diing.com/upload/files/89161531688.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/dopisezitakaxotimuwixafe.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/45889312132.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/metofafumu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613993b1da192---33058183624.pdfIn PDF document text
    • http://ombs.ru/uploads/files/52725863086.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210918214321.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 11356 bytes
SHA-256: dd67a40314d4fe67099b5bd8b88d1d2a5c7c30e27119323f7150004783483414
font_02_sfnt_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 16604 bytes
SHA-256: 2495a625748a9d87c140a2a2196f496208be9279eddc2a298f2d8052d9409d8c

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